STATEN ISLAND, N.Y. -- Pointing to questions over the improper use of staff by Rep. Michael McMahon when he was a member of the New York City Council, Republican congressional challenger Michael Grimm is calling for a probe into whether McMahon improperly used government resources in the recent "Jewish money" campaign flap.

Staten Island AdvanceMichael Grimm, right, wants to know more about what led to Rep. Michael McMahon's 'Jewish money' fundraising list.

Grimm noted U.S. House of Representative rules forbid official resources, such as House offices, to be used for campaign or political purposes.

Former McMahon campaign spokeswoman Jennifer Nelson has been quoted as saying a list of "Jewish money" Grimm donors was compiled after a discussion with McMahon's Washington staff in his House office.

Grimm served up a letter to the House Office of Congressional Ethics penned by one of his campaign supporters calling for an investigation into the possible use of McMahon's government resources for political purposes.

"Sadly this is not the first time Congressman McMahon has done this sort of thing," Grimm said in a statement, noting 2007 reports that then-Councilman McMahon "had one of his staff members perform personal tasks for him on city time."

At the time, the city Department of Investigation found that while a McMahon staffer performed personal chores for McMahon and his daughter on city time, it cleared him of allegations that he had compelled staff to do campaign work during the work day."Perhaps if Congressman McMahon is truthful and forthcoming he can avoid some of the problems his colleague and patron, Congressman Rangel, is currently having," said Grimm. "It is time for Congressman McMahon to be honest with the public."

McMahon campaign manager Jonathan Yedin could not be reached for comment.

Last week, the Grimm camp filed a complaint with the Federal Election Commission over whether a "Jewish money" list was allegedly created by the McMahon camp after being culled from FEC reports to solicit potentially poachable donors, a possible violation of FEC rules.

The McMahon camp has declined to say who ordered the list to be compiled.